I have some insulation leftover from when I built my keezer. It didn't cost much but if someone wants it (free) it won't wind up in a landfill. I build a 12x1 inch collar on a 7.2 cubic foot kenmore keezer. The amount I have leftover is enough to do another freezer collar of a similar size or even a bit bigger. I am in Madison, WI.
Its definitely not worth shipping.